Yes, really like streamdancer, and that triggered this thought process in a way, SD uses worm-drives in open tunnels I think, but I believe a prop is a worm-drive cut-off after the first segment of the screw (hence props are aka "screws"...), and so wondered if a fully enclosed prop in a tunnel wih a nozzle at the end could be an efficient device - isn`t this the simplest form of axial water-jet???
--- In electricboats@yahoogroups.com, "Ed Bachmann edbz" <edbz@...> wrote:
>
> You might check out John Zimmerlee’s design for a design real close to the one you envision:
>
> http://www.streamdancer.com/
> http://www.youtube.com/watch?v=RjFxYWHkmKE
> http://www.youtube.com/watch?v=XkknAR1tmLY&feature=related
>
> I have been pondering the idea of using a rechargeable drill to drive a small prop for a kayak.
>
>
> From: Andrew
> Sent: Saturday, March 26, 2011 4:21 PM
> To: electricboats@yahoogroups.com
> Subject: [Electric Boats] teeny tiny jet-power
>
>
> Hi all, I`m designing a decked canoe at the mo, and thought to design it around installing twin ducted fans, or axial-flow "jets" - single or twin tunnel fans I suppose - running off .25hp (200w) motors. Thing is I do not want to use a trolling motor (too easy), and can only find info on very large water-jets, has anyone got any experience with this type of drive-train? As its a canoe, my target max speed is 6 knots, and cruise of 4 knots. Projected loa is 13ft, beam 32", dry weight 25kg - she`ll be skin-on-frame with local re-inforcing where needed. As I`ll be beach launching, any installation below the skeg is not an option
>
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